My brain goes straight to silicon bronze or alumna bronze filler based off just that pic. Only way I know to get a gold colour to an alum bead. Even when I weld dirty old cruddy aluminium I still don't get a gold colour. Just lots of black and that lovely burnt looking greyish blue colour that alum...

Can anyone help me out? Someone sent an aluminum part that was already welded, it is supposed to be TIG welded but this looks to be MIG, they wanted me to run a bead on the backside but I've returned the part... My question is how is there color inside the weld? I've only ever used a spool gun once ...

Aerospace tig welder for about 10 years now, looking to pose some questions on the forum.